Correct option is C
The correct synonym of the given word is (c)
Ignorant.
Oblivious: Unaware of or not concerned about what is happening around one. (बेखबर)
Example: He walked into the room, oblivious of the tension.
Ignorant: Lacking awareness or knowledge. (अनजान, अज्ञानी)
Example: She was ignorant of the danger around her.
Synonyms: unaware, heedless, unconscious, blind.
Antonyms: aware, mindful, alert, attentive.
Meanings of other options:
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(a) Careful: Showing attention and caution (सावधान)
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(b) Aware: Having knowledge or perception (जागरूक)
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(d) Suspecting: Believing something is true without proof (संदेह करना)